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        <h1>Pudd: Puppy universal dd</h1>


        <p>This is the first version of Pudd, and it is expected many enhancements
will follow.</p>


        <h2>Some notes on terminology</h2>


        <p>The words "disk drive" or "hard drive" refer to the entire physical drive,
whereas a "partition" is part of the drive that can hold a "filesystem".</p>


        <p>For example, in the Unix/Linux world, an entire drive may be named like
this: /dev/sda, whereas the partitions inside it may be named /dev/sda1,
/dev/sda2, etc.</p>


        <p>The problem with this terminology is that in the Windows/DOS world the
word "drive" may refer to a partition, not the entire drive. For example,
"drive C:" is really a partition. It is more correct to refer to C: as a
"logical drive", which is also a term used in the Windows/DOS world.</p>


        <p>It is also necessary to distinguish between a partition and a filesystem,
which again is blurred in the Windows/DOS world. You can create a partition
in a hard drive, then create a filesystem inside it. Examples of filesystems
are msdos, vfat, ntfs, ext2, ext3 and reiserfs.</p>


        <p>A point of confusion here is the DOS "format" program. This actually
creates a msdos filesystem in a partition. The DOS "fdisk" program can create
and delete partitions. (note that Linux also has a "fdisk" program, and it is
in Puppy)</p>


        <h2>Copying drives or partitions</h2>


        <p>When I use the word "drive" I am normally referring to the entire drive. I
use "partition" when I am referring to a partition.</p>


        <p>Pudd can copy an entire drive or a partition. There are some restrictions
here, that I hope to alleviate in future versions of Pudd:</p>

        <ul>
<li>A drive can only be copied to another identical drive. For example, you
    can copy a 2GB SD card to another 2GB SD card (I
    don't know yet if there are any problems copying between different
    models/makes of SD card, or other types of Flash cards).</li><li>A partition can be copied to another partition that is the same size or
    bigger. There are some details to be worked out here: for now, they must
    be set to have the same filesystem type. The source filesystem will
    overwrite whatever is in the destination partition. So far, Pudd can only
    resize ext2, ext3 and ext4 filesystems to fill the destination partition.</li>
        </ul>


        <p>Pudd allows you to copy a drive/partition to a file, then you could copy
the file to a drive/partition. However, you cannot mix the two. That is, you
cannot copy a drive to a file then file to partition, as the file will
contain the image of the entire drive, not just a single partition.</p>




Regards,<br>

Barry Kauler</td>
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